(19)

(11)

EP 1 649 633 A1

(12)

(43) Date of publication: 26.04.2006 Bulletin 2006/17 (21) Application number: 04786106.7 (22) Date of filing: 27.07.2004

(51) International Patent Classification (IPC):  H04L 9/12(1990.01) (86) International application number: PCT/US2004/023940 (87) International publication number: WO 2005/015819 (17.02.2005 Gazette 2005/07)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 29.07.2003 US 490686 P (71) Applicant: Thomson Licensing 92100 Boulogne-Billancourt (FR)	(72) Inventors: ZHANG, Junbiao Bridgewater, New Jersey 08807 (US) MATHUR, Sayrabh Plainsboro, New Jersey 08536 (US) (74) Representative: Berthier, Karine  THOMSON, European Patent Operations, 46 Quai Alphonse Le Gallo 92648 Boulogne Cédex 92648 Boulogne Cédex (FR)